Question 1

Factors that affect the rate of enzyme catalyzed reactions include:

Accepted Answer

A)  temperature
B)  pH
C)  concentration of enzyme
D)  all of theseE) A) and C)
F) A) and B)

Question 2

Oxidation is defined as the ________ while reduction is the ________ .

Accepted Answer

A)  gain of electrons,loss of protons
B)  loss of electrons,gain of protons
C)  loss of electrons,gain of electrons
D)  loss of protons,gain of protonsE) B) and D)
F) All of the above

Question 3

Glucose is to photosynthesis as pyruvate is to:

Accepted Answer

A)  oxidative phosphorylation
B)  glycolysis
C)  fermentation
D)  Krebs cycleE) All of the above
F) None of the above

Question 4

The initial breakdown of glucose in a eukaryotic cell takes place in the _____.

Accepted Answer

A)  cytoplasm
B)  golgi
C)  nucleus
D)  cell membranesE) None of the above
F) A) and D)

Question 5

Which of the following statements about enzyme inhibition is true

Accepted Answer

A)  Most noncompetitive inhibitors bind to several different sites on an enzyme.
B)  Enzymes become less efficient as temperatures drop because they begin to denature.
C)  Noncompetitive inhibitors bind to a site other than the active site.
D)  Most human enzymes have an optimum temperature below normal body temperature.E) A) and B)
F) A) and D)

Question 6

Competitive inhibition of enzymes occurs when the inhibitor:

Accepted Answer

A)  binds to the active site of the enzyme.
B)  binds to the allosteric site of the enzyme.
C)  inhibitor changes the shape of the enzyme.
D)  inhibitor is acted upon by the enzyme.E) None of the above
F) All of the above

Question 7

Enzymes work by:

Accepted Answer

A)  lowering the energy of the reactants.
B)  raising the energy of the products.
C)  decreasing the activation energy of the reaction.
D)  increasing the activation energy of the reaction.E) A) and B)
F) B) and D)

Question 8

Organisms which get their carbon from other organisms are:

Accepted Answer

A)  autotrophs
B)  chemotrophs
C)  phototrophs
D)  heterotrophsE) A) and C)
F) C) and D)

Question 9

An enzyme-substrate complex forms when substrate binds to an enzyme at the enzyme's ______ site.

Accepted Answer

A)  catalytic
B)  allosteric
C)  operative
D)  activeE) A) and B)
F) All of the above

Question 10

The green sulfur and purple sulfur bacteria are capable of:

Accepted Answer

A)  carrying out photosynthesis
B)  only obtaining energy from organic molecules
C)  bypassing glycolysis for the Krebs cycle
D)  metabolizing without enzymesE) All of the above
F) A) and D)

Question 11

How does concentration affect enzyme-catalyzed reactions

Accepted Answer

A)  As the concentration of the product goes up the enzyme increases the rate it produces the product.
B)  Concentration does not affect enzyme-catalyzed reactions because they are irreversible.
C)  At chemical equilibrium,no net change in the concentration of the product or substrate occurs.
D)  The quantity of enzyme available usually controls the rate of a metabolic reaction.E) A) and C)
F) B) and D)

Question 12

In the electron transport chain,the energy to make ATP comes directly from _____.

Accepted Answer

A)  FAD
B)  NADH
C)  both FAD and NADH
D)  neither FAD nor NADHE) A) and B)
F) B) and C)

Question 13

Organisms that can use oxygen for metabolic reactions but can also function in an environment devoid of oxygen are termed _____.

Accepted Answer

A)  aerobes
B)  anaerobes
C)  aerophiles
D)  facultative anaerobesE) B) and C)
F) A) and B)

Question 14

During glycolysis,electrons are initially transferred to:

Accepted Answer

A)  NAD⁺
B)  FAD
C)  NADP
D)  H₂OE) A) and B)
F) None of the above

Question 15

Chemoautotrophic bacteria obtain the energy they need from:

Accepted Answer

A)  the reactions of photosynthesis
B)  sunlight
C)  carbon dioxide in the atmosphere
D)  chemical reactions in their cytoplasm centered around the use of inorganic substancesE) B) and C)
F) A) and D)

Question 16

Photoautotrophs obtain energy from:

Accepted Answer

A)  light and use carbon dioxide as a carbon source
B)  organic molecules and use carbon dioxide as a carbon source
C)  inorganic substances and use carbon dioxide as a carbon source
D)  light and use organic substances as a carbon sourceE) B) and C)
F) B) and D)

Question 17

Which reaction takes place in the mitochondrial membrane

Accepted Answer

A)  Glycolysis
B)  Fermentation
C)  Krebs cycle
D)  Electron transport chainE) B) and C)
F) A) and D)

Question 18

What is returned to chlorophyll in cyclic photophosphorylation that is not returned in non-cyclic photoreduction

Accepted Answer

A)  ATP
B)  Light
C)  Energy
D)  ElectronsE) None of the above
F) B) and C)

Question 19

Animals (humans for example) are:

Accepted Answer

A)  photoautotrophs
B)  photheterotrophs
C)  chemoautotrophs
D)  chemoheterotrophsE) A) and C)
F) A) and B)

Question 20

In algae,the dark reactions of photosynthesis occur in the:

Accepted Answer

A)  cell membrane
B)  matrix of the mitochondria
C)  stroma of the chloroplast
D)  nucleusE) B) and D)
F) C) and D)

Exam 6: Essential Concepts of Metabolism

Enzymes work by:

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Which of the following statements about enzyme inhibition is true

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Photoautotrophs obtain energy from:

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During glycolysis,electrons are initially transferred to:

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Organisms that can use oxygen for metabolic reactions but can also function in an environment devoid of oxygen are termed _____.

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The initial breakdown of glucose in a eukaryotic cell takes place in the _____.

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Animals (humans for example) are:

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Which reaction takes place in the mitochondrial membrane

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Organisms which get their carbon from other organisms are:

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Factors that affect the rate of enzyme catalyzed reactions include:

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An enzyme-substrate complex forms when substrate binds to an enzyme at the enzyme's ______ site.

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The green sulfur and purple sulfur bacteria are capable of:

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Oxidation is defined as the ________ while reduction is the ________ .

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In the electron transport chain,the energy to make ATP comes directly from _____.

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How does concentration affect enzyme-catalyzed reactions

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Chemoautotrophic bacteria obtain the energy they need from:

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Glucose is to photosynthesis as pyruvate is to:

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Competitive inhibition of enzymes occurs when the inhibitor:

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What is returned to chlorophyll in cyclic photophosphorylation that is not returned in non-cyclic photoreduction

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In algae,the dark reactions of photosynthesis occur in the:

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Oxidation is defined as the while reduction is the .

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